The Hebrew adjective adom (אָדֹם) means simply red — the color. It belongs to the adam root family (H119) that connects redness with earth, humanity, and blood. In the Old Testament, adom is used to describe red animals (such as the red heifer of Numbers 19 and red horses of Zechariah), red items (like lentil stew in Genesis 25), and the red appearance of Esau at birth (which became the basis for the name Edom).
The word appears in some of the most memorable passages of Scripture — Esau's red stew, the red heifer ceremony, and the apocalyptic red horses of prophetic vision.
Red in biblical symbolism carries a spectrum of meaning: blood, life, sacrifice, war, sin, and judgment. The red heifer (Numbers 19) was a purification offering — its redness associated with the blood that cleanses. Isaiah 1:18 uses redness as a metaphor for sin, making the promise of white transformation all the more dramatic.
In Revelation, red horses signal war (6:4), the red dragon symbolizes Satan, and 'Babylon' is clothed in scarlet (17:4). Yet even in judgment, red points toward blood — the blood of Christ that both condemns and redeems. The color itself is morally neutral; it is the context — sacrifice, sin, or war — that gives it its charge. In God's economy, what was stained red by sin can be made white as snow through the blood of the Lamb (Revelation 7:14).